HW-101 trouble shooting

[Dave Larson]

Hi Jim.  You might want to take a look at c423. According to the schematic
it is connected to pin 3 of the 6CL6 (looks like pins 3 and 8 are connected
to the screen grid). C423 may be shorted but with 6CL6 pulled from socket it
wouldn't smoke screen resistor.  You may also may want to take a look at
C403.  If it is leaky, it could bias the 6CL6 on too much. You could also
lift on side of C403 and see if it is a DC problem or if RF drive is causing
it to burn up.
Good luck Jim.

Dave WB0TSR

At 01:10 PM 1/21/01 -0500, you wrote:
>Hello to the list,
>
>I have a HW-101 that I have come to the end of my rope on. The receiver
>works great.  The transmit relays work fine.  When tuning up R405 smokes.
>
>R405 on the RF board smokes when the mode switch is placed in "tune".  I
>have traced the wiring that seems to have a connection.  I have checked the
>components that seem to have a connection.  I have removed the 6146's and it
>still smokes.  I have removed the 6CL6 driver and there is no smoke.  If I
>replace the 6CL6 with a known good driver, it again smokes.
>
>I am missing something somewhere, but I do not know where the possible
>problem can be.
>
>Perhaps someone on the list can look at their schematic and let me know a
>few possible areas to check, or specific parts to check that would
>contribute to damaging R405.  Perhaps someone has had this same problem and
>would pass on to me their fix.  Thanks for any and all assistance that will
>help with my problem.
>
>Sincerely,
>
>Jim
>73, KF4ICZ
>
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